Implantation ? Or something else ?

Daisy
So I had unprotected sex throughout my fertile window . My expected period was 2 days ago 
8-30-16 >> nothing ALL day no cramps, bleeding nothing .. The next day 
8-31-16 >> at 8am I noticed pink/brownish discharge/blood ONLY when I wiped .. So I thought it was Af coming so I put on Pad And again No cramps . Later that day about 4hours later I checked my Pad and there was NOTHING on it no blood at all . So I thought maybe it will come later But no blood had came at all that day/night 
9/1/16 >> today I woke up and checked again which is now 24 hours later and still NO blood on Pad .. I went to pee and when I wiped there was pinkish/brown discharge/blood again so it's On and off
So, I guess my question is why haven't my period Flow began yet if its my period . Or is it  Late implantation since I'm about 14 DPO
Or maybe even early pregnancy bleeding ?